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Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Precast tunnel linings"

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Copsey, J. P., and S. R. Doran. "Design of precast concrete segmental tunnel linings." Construction and Building Materials 1, no. 3 (September 1987): 134–46. http://dx.doi.org/10.1016/0950-0618(87)90014-6.

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2

BRACHER, Gustav. "Durability Design of Precast Concrete Segments for Tunnel Linings." IABSE Congress Report 16, no. 16 (January 1, 2000): 721–28. http://dx.doi.org/10.2749/222137900796313573.

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3

Abbas, Hajer Satih, Maadh Imad Salman Al-Rubaye, Sarra’a Dhiya’a Jaafer, Bassam farman bassam, and Abdelmajeed Alkasassbeh. "Three-dimensional numerical study of the reactive powder concrete segments in tunnel lining." Curved and Layered Structures 9, no. 1 (January 1, 2022): 286–94. http://dx.doi.org/10.1515/cls-2022-0022.

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Abstract The tunnel lining systems act as lines of defence against the forces and geotechnical situations. The use of precast concrete tunnel linings (PCTLs) has been escalating due to its effective and economical installation process. The tunnels usually suffer from the premature deterioration due to corrosion of the reinforcement and thus need maintenance. Corrosion leads to the distress in PCTL leading to the cracking and finally the scaling of concrete. This study aims to assess the structural durability performance of reactive powder concrete (RPC) as the material of tunnel lining segments compared to reinforced concrete (RC) and high performance concrete (HPC). The numerical findings indicated that the maximum load capacity of PRC-PCTL segments was greater than that of the corresponding RC and HPC segments. Regarding the findings, PRC is a very significant option for conventional segments. The high strength of PRC can decrease the thickness of the PCTL segments, resulting in the decreased material cost. Also, PRC-PCTL segments can eliminate the laborious and costly production of RC segments and mitigate the corrosion damage and thus enhance the service life of lining segments.
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Gong, Chenjie, Wenqi Ding, Kenichi Soga, and Khalid M. Mosalam. "Failure mechanism of joint waterproofing in precast segmental tunnel linings." Tunnelling and Underground Space Technology 84 (February 2019): 334–52. http://dx.doi.org/10.1016/j.tust.2018.11.003.

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5

Shayanfar, Mohsen Ali, Payman Mahyar, Ahmad Jafari, and Mohammad Mohtadinia. "Classification of Precast Concrete Segments Damages during Production and Transportation in Mechanized Shield Tunnels of Iran." Civil Engineering Journal 3, no. 6 (June 30, 2017): 412–26. http://dx.doi.org/10.28991/cej-2017-00000101.

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Precast concrete segments used in shield tunnel linings are prone to damage in many situations. These damages can occur at different stages such as fabrication in segment factory, transportation to tunneling site, during tunneling process, and at serviceability stage. The aim of the present article is to study the damages inflicted on concrete segments during production and transportation, and to present a new classification of these damages throughout the two stages. The developed classification is based on field observations and examinations of major subway and water conveyance mechanized shield tunnels of Iran, located in Tehran, Tabriz, Mashhad, Kermanshah (Nosood) and Isfahan (Golab). The quality of tunnel lining suffers from what, as a direct consequence of any damage to concrete segments, during production and transportation, which will be also discussed in this article. For further investigation, more than 250 concrete segments from Tehran subway line 3 and 350 segments of concrete segments from Tehran subway line 7 were selected and studied for a statistical analysis of chipping and crack, consecutively. Absence of preventive measures to limit segment damages in precast segment factories is one of the main reasons for increased number of damaged concrete segments, and as a result, increased costs of tunnel construction at later stages. In this paper, production phase damages and factors contributing to these damages are studied. According to the findings of the study, the human (operator) error was the most important cause for chipping, and, time-dependent behavior of concrete was the essential reason in crack of precast segments. Eventually, final section of the article presents practical solutions for reduction of damages during fabrication and transportation of concrete segments.
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Cugat, V., S. H. P. Cavalaro, J. M. Bairán, and Albert de la Fuente. "Safety format for the flexural design of tunnel fibre reinforced concrete precast segmental linings." Tunnelling and Underground Space Technology 103 (September 2020): 103500. http://dx.doi.org/10.1016/j.tust.2020.103500.

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Serafini, Ramoel, Sérgio R. A. Dantas, Ronney R. Agra, Albert de la Fuente, Antonio F. Berto, and Antonio D. de Figueiredo. "Design-oriented assessment of the residual post-fire bearing capacity of precast fiber reinforced concrete tunnel linings." Fire Safety Journal 127 (January 2022): 103503. http://dx.doi.org/10.1016/j.firesaf.2021.103503.

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Kim, Yun Yong. "Fire Resistance Performance of Precast Segmental Concrete Lining for Shield Tunnel." Journal of the Korean Society of Civil Engineers 34, no. 1 (2014): 95. http://dx.doi.org/10.12652/ksce.2014.34.1.0095.

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9

Du, Shaoshuai, and Jinhua Tang. "State-of-the-Art Review on Failure Mechanism and Waterproofing Performance of Linings for Shield Tunnels." Advances in Civil Engineering 2022 (March 8, 2022): 1–9. http://dx.doi.org/10.1155/2022/6104725.

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The introduction and development of shield tunnels have led to the innovation of precast segmental linings, which has significant advantages in improving the construction speed compared with in-situ cast concrete linings. However, damage of the linings and water leakage at the lining joints highlight defects in the design and construction of the linings. In this regard, it is necessary to investigate the failure mechanism of linings for shield tunnels and evaluate the waterproofing performance and repercussions of lining joints. The relevant research results published in recent years are reviewed in this paper, focusing on the failure mechanisms of linings and the waterproofing performance of lining joints. Progressive failure and instability of linings are introduced. Progressive failure has three stages: initial elastic stage, local damage stage, and overall failure stage. The performance-based design of joint waterproofing is described in seven steps. Further opportunities for the investigation of this topic are discussed.
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Duan, Yawei, Mi Zhao, Jingqi Huang, Huifang Li, and Xiuli Du. "Analytical Solution for Circular Tunnel under Obliquely Incident P Waves considering Different Contact Conditions." Shock and Vibration 2021 (December 22, 2021): 1–23. http://dx.doi.org/10.1155/2021/1946184.

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An analytical solution for the seismic-induced thrust and moment of the circular tunnel in half-space under obliquely incident P waves is developed in this study, which is the superposition of the solution for deep tunnels under incident and reflected P waves and the reflected SV waves. To consider tangential contact stiffness at the ground-tunnel interface, a spring-type stiffness coefficient is introduced into the force-displacement relationship. Moreover, the tunnel lining is treated as the thick-wall cylinder, providing more precise forecasts than beam or shell models used in previous analytical solution, especially for tunnels with thick lining. The reliability of the proposed analytical solution is assessed by comparing with the dynamic numerical results. Based on the proposed analytical solution, parametrical studies are conducted to investigate the effect of some critical factors on the tunnel’s seismic response, including the incident angles, the tangential contact stiffness at the ground-tunnel interface, and the relative stiffness between the ground and the tunnel. The results demonstrate that the proposed analytical solution performs well and can be adopted to predict the internal forces of circular tunnels under obliquely incident P waves in seismic design.
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Дисертації з теми "Precast tunnel linings"

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Arnau, Delgado Oriol. "Structural response of precast concrete segmental tunnel linings." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/81563.

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The increasing use of the tunnel boring machines (TBMs) has entailed their own evolution and the improvement of the construction processes applied, allowing the construction of tunnels on more complex hydro-geological conditions. These new drilling facilities imply that higher ground and water pressures have to be resisted by the structural lining, turning its design into a key item in all current tunnel projects. TBMs construction process is mainly associated to precast concrete segmental tunnel linings, which are consisted of concrete rings sequentially placed as the tunnel drilling advances. Despite segmental tunnel linings are widely used, their structural response presents significant uncertainties due to the particular configuration on multiple precast pieces and the evolutionary construction process applied. The improvement and optimization of segmental tunnel linings, necessary to obtain safer structures at a lower cost, requires a significant advance in the knowledge of their structural response and about the appropriate techniques to properly reproduce it. This PhD thesis present the mechanisms and phenomena involved in the structural response of precast concrete segmental tunnel linings, detailing numerical modeling strategies to properly simulate them. The integration of all these techniques in a unique model allows the analysis of a real tunnel lining subjected to different scenarios, determining the influence and relevance of the main parameters defining a tunnel and its structural lining. Present research departs from an innovative in situ test carried out at Line 9 subway tunnel in Barcelona. The treatment and analysis of the obtained data provides experimental evidences about the structural response of segmental tunnel linings and the main involved mechanisms and phenomena. Different numerical simulation strategies are developed in order to properly reproduce such mechanism and phenomena, achieving a reliable simulation of an isolated ring response. The longitudinal response of the segmental concrete linings is obtained through the detailed study of the construction process applied and the ground-structure interaction mechanisms. The knowledge of the longitudinal force present at a segmental tunnel lining is of paramount importance in order to determine the interaction degree between adjacent rings and the consequent three-dimensionality of the lining response. Finally, the numerical simulation of a real tunnel section subjected to different scenarios of load and boundary conditions determines the influence of the three-dimensional effects on segmental concrete linings response, concluding about its structural implications in respect to the isolated ring approach usually employed in design processes.
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GORINO, ANDREA. "Ductility of lightly reinforced and fiber-reinforced concrete elements: A unified approach." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2674226.

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Lightly Reinforced Concrete (LRC), Fiber-Reinforced Concrete (FRC), and Hybrid Reinforced Concrete (HRC) elements subjected to static bending actions exhibit a similar behavior, which depends on the amount of rebar and/or fibers added to the cementitious matrix. In all the cases, if a suitable reinforcing system is not provided, the brittle failure occurs at the cracking of concrete. Hence, a new and unified approach is introduced in the present thesis to evaluate the minimum reinforcement for static reasons. Such approach is based on the definition of the ductility index ( DI ), which is a function of the difference between the ultimate load and the effective cracking load. Therefore, DI is higher than zero when a lightly reinforced member shows a ductile response, whereas it is negative in case of brittle behavior. To study the brittle/ductile transition (i.e., the minimum reinforcement), the flexural behavior of concrete beams containing low amounts of rebar, fibers, or a combination, is predicted through three general models for LRC, FRC, and HRC members. In addition, test results coming from the available literature and a specific experimental campaign are considered. Both numerical and experimental data reveal the existence of a generally valid linear envelope of DI when the reinforcement varies in a concrete member. Based on these results, a design-by-testing procedure can be established for determining the minimum reinforcement of a LRC and/or FRC element, which corresponds to DI equal to zero. Moreover, the minimum reinforcement of an HRC element is defined by any linear combination of the associated minimum amounts of sole rebar and fibers. The proposed approach is adopted to design the minimum reinforcement of precast concrete segments for a tunnel lining. It is applied to LRC, FRC, and HRC members, not only subjected to pure flexure but also under combined axial force and bending moment. Finally, the ductility index is used as functional unit of a simplified sustainability analysis. In the specific case of lightweight FRC one-way plates, this new parameter allows to measure the performances of the concrete elements in combined ecological and mechanical analyses, with an integrated holistic approach.
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Fernandes, Andrea. "Utilização de fibras de aço para reforço de concreto em aneis pre-moldados segmentados para revestimento de tuneis." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/257680.

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Orientador: Newton de Oliveira Pinto Junior
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo
Made available in DSpace on 2018-08-08T03:07:34Z (GMT). No. of bitstreams: 1 Fernandes_Andrea_M.pdf: 3789790 bytes, checksum: 3995163d23effcb84c04682718a55ef9 (MD5) Previous issue date: 2005
Resumo: O reforço do concreto através da utilização de fibras de aço vem se mostrando, ao longo dos anos, como alternativa econômica e tecnicamente viável para diversos tipos de aplicações . Sua ampla utilização na indústria da construção mundial, em diversos casos de sucesso, despertou interesse também do segmento tuneleiro moderno. Passou-se a utilizar fibras para reforçar o concreto das aduelas dos anéis montados por tuneladoras (TBM- Tunnel Boring Machines ¿ máquina de escavar túneis) nas principais obras ao redor mundo. Desta forma, após diversos anos sem obras importantes de túneis metroviários no Brasil, a construção da linha 4 (Amarela) do Metrô de São Paulo, utilizará uma destas máquinas de escavar túneis, sendo do tipo EPBM (Earth Pressure Balanced Machine), cujo revestimento será feito com anéis segmentados (aduelas) de concreto. O projeto básico desta obra (década de 60) prevê armação das aduelas de forma tradicional (em desuso) com gaiolas de aço. Em virtude dos benefícios que o reforço com fibras oferece, e ainda, baseando-se no sucesso da experiência mundial, surgiu a necessidade de um estudo no Brasil sobre esta tecnologia. Assim, tomando como base os dados do projeto básico do projeto da linha 4 (cargas, geometrias, etc.), iniciou-se um estudo comparativo do reforço com gaiolas e do reforço com fibras de aço. Este trabalho apresenta algumas etapas deste estudo, procura abordar aspectos relevantes do processo desde a fabricação até a instalação das aduelas no túnel, explica os benefícios possíveis de serem atingidos, resume alguns dos principais motivos que levaram a indústria tuneleira a adotar a tecnologia de reforço com fibras de aço, vantagens e desvantagens
Abstract: The reinforcement of the concrete using steel fibers became possible, through the years, by it¿s economical and technical viability. It¿s wide range of utilization in civil construction, in several success work cases, made the modern tunneling industry realize the necessity of studding it as well. Concrete Segmental Lining Rings placed by TBMs - Tunnel Boring Machines - have been produced with Steel Fiber in the ultimate reference jobs around the world. After several years without of Metro projects in São Paulo Brasil, the already under construction line 4 with total 12,8 km of tunnels, will use one EPBM - Earth Pressure Balanced Machine ¿ witch lining is being considered made by reinforced concrete. The Basic Project (from the 60¿s) primarily considered steel bars as cage reinforcement. To benefit from the steel fiber reinforcement concrete, still, based on successful practical cases world wide, became the necessity to study this technology locally, in Brasil. Thus, taking the basic data from the original Line 4 project (geometry, etc.) a comparative study between steel cages and steel fibers started. This work contents some of the steps from this study and intents to evaluate key aspects from the whole process, since production phase at the segment plant, transport, installation and maintenance of the tunnel. Also explains the basic reasons of migration to the steel fiber reinforcement, including the benefits for the whole tunneling industry and society
Mestrado
Edificações
Mestre em Engenharia Civil
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Частини книг з теми "Precast tunnel linings"

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Winterton, T. R. "Developments in precast concrete tunnel linings in the United Kingdom." In Tunnelling’ 94, 601–33. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2646-9_35.

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Hosseini, Seyed Mohammad, Salaheldin Mousa, Hamdy Mohamed, and Brahim Benmokrane. "Application of GFRP Bars in Precast Concrete Tunnel Lining Segments." In 8th International Conference on Advanced Composite Materials in Bridges and Structures, 187–95. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09409-5_21.

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Patel, Devansh, Chidchanok Pleesudjai, Yiming Yao, Steve Schaef, and Barzin Mobasher. "Validation Testing of Precast Tunnel Lining Segments Using Polymeric Fibers." In RILEM Bookseries, 820–30. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-83719-8_70.

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Ibrahim, Basil, Salaheldin Mousa, Hamdy M. Mohamed, and Brahim Benmokrane. "GFRP Reinforced Precast Concrete Tunnel Lining Segments Under Flexural Cyclic Loading." In 8th International Conference on Advanced Composite Materials in Bridges and Structures, 149–56. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09409-5_17.

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Hosseini, S. M., S. Mousa, H. M. Mohamed, and B. Benmokrane. "Efficiency of Precast Concrete Tunnel Lining Segments Reinforced with GFRP Bars Under Bending Load." In Lecture Notes in Civil Engineering, 103–11. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0656-5_9.

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Wrixon, D., and G. Bracher. "A durability design for precast concrete segments for tunnel linings." In North American Tunneling 2004. Taylor & Francis, 2004. http://dx.doi.org/10.1201/9781439833759.ch62.

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Fortunato, D., and G. Barbieri. "Tunnels widening and renewal using precast lining: The Swiss Rhaetian railway construction method applied to tunnel Mistail." In Tunnels and Underground Cities: Engineering and Innovation meet Archaeology, Architecture and Art, 2100–2108. CRC Press, 2019. http://dx.doi.org/10.1201/9780429424441-222.

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Meda, Alberto, and Zila Rinaldi. "Steel-fibre reinforcement for precast lining in tunnels with different diameters." In fib Bulletin 79. Fibre-reinforced concrete: From design to structural applications, 363–72. fib. The International Federation for Structural Concrete, 2017. http://dx.doi.org/10.35789/fib.bull.0079.ch35.

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Scaffidi, S. C., A. Anders, S. Porto, and E. Torres. "Forrestfield airport link project in Perth, Western Australia – precast concrete segmental lining." In Tunnels and Underground Cities: Engineering and Innovation meet Archaeology, Architecture and Art, 6170–79. CRC Press, 2020. http://dx.doi.org/10.4324/9781003031871-43.

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Scaffidi, S. C., A. Anders, S. Porto, and E. Torres. "Forrestfield airport link project in Perth, Western Australia – precast concrete segmental lining." In Tunnels and Underground Cities: Engineering and Innovation meet Archaeology, Architecture and Art, 6170–79. CRC Press, 2019. http://dx.doi.org/10.1201/9780429424441-653.

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Тези доповідей конференцій з теми "Precast tunnel linings"

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Kong, Xiangxun, Yonghui Luo, and Shaojun Wang. "Research on the Joint Waterproofing of Precast Segmental Tunnel Linings in Water-Rich Stratum." In International Conference on Construction and Real Estate Management 2021. Reston, VA: American Society of Civil Engineers, 2021. http://dx.doi.org/10.1061/9780784483848.040.

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Song, Fanbing, and Rolf Breitenbücher. "Load-Bearing Behavior of Steel Fiber-Reinforced Concrete for Precast Tunnel Lining Segments under Partial-Area Loading." In Geo-Shanghai 2014. Reston, VA: American Society of Civil Engineers, 2014. http://dx.doi.org/10.1061/9780784413449.027.

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